Backdash Hardboard ~ Paint?

Good Morning All!

The backdash "hardboard" needs to repainted...I've got what I need here to do it, just need some of your expert advise.

On the seam of the hard board it is flaking (just a little) What should I use to seal that back down or how can I fix it? Just don't want the paint to make it seperate or make the hardboard soak it up and expand.



~ Enjoy your java and chat back. Many Thanks, Bea